#include <bits/stdc++.h> // clang-format off #define princess_connect(file,extention) if(fopen(file "." extention, "r")) freopen(file "." extention, "r", stdin) #define yabai_desune ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0) #define __Pecorine__ signed main() #define For(i, l, r) for (int i = l; i <= r; i++) #define Fod(i, r, l) for (int i = r; i >= l; i--) #define ll long long #define pb push_back #define sz(yuuki) (int)yuuki.size() #define bit(x, i) (x >> i) & 1 #define endl "\n" using namespace std;/* // ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠀⠀⠀⠀⠙⠻⠟⠛⠻⢿⣿⣿⣿⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⣿⣿⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⣿⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣿⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣯⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⣿ ⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡆⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⣿ ⣿⣿⣿⡟⠿⠿⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣀⠀⢸⣿ ⣿⡄⠀⠀⠀⠀⠀⠻⠿⣿⣿⣿⣿⣿⡷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣼⣿⣿⣿ ⣿⣷⡀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠛⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿ ⣿⣿⣿⣷⣶⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⣿⣿⣿ ⣿⣿⣿⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠋⣉⣽ ⣿⣿⣿⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⣿⣿ ⣿⣿⣿⣿⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢿⣿ */ // clang-format on const int inf = 2e9; const int mxn = 2 * 1e5 + 7; const int mod = 1e9 + 7; int n; vector<int> a(mxn); __Pecorine__ { yabai_desune; princess_connect("yabai", "desune"); cin >> n; For(i, 1, n) cin >> a[i]; For(i, 1, n) { a[i + n] = a[i]; } int res = 0; For(i, 1, n) { int total = 0, total1 = 0; For(j, i, i + n / 2 - 1) { total += a[j]; } Fod(j, i + n, i - n / 2 + n + 1) { total1 += a[j]; } res = max(res, min(total1, total)); } cout << res; }

hac.cpp: In function 'int main()':
hac.cpp:2:84: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define princess_connect(file,extention) if(fopen(file "." extention, "r")) freopen(file "." extention, "r", stdin)
      |                                                                             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hac.cpp:40:5: note: in expansion of macro 'princess_connect'
   40 |     princess_connect("yabai", "desune");
      |     ^~~~~~~~~~~~~~~~